1. Adding Semantics to Structure
    1. Organizing Documents with Headings
    2. Grouping and Ordering Data with Lists
      1. Unordered Lists
        1. Changing the List Item Delimiter
        2. Compacting Your List
      2. Ordered Lists
        1. Setting a List Start Value
        2. Manipulating an individual list item value
        3. Mixing list types in nested lists
      3. Definition Lists
        1. Nesting Ordered or Unordered Lists within Definition Lists
    3. Emphasizing Important Content
      1. Inline Emphasis
      2. Block-level Emphasis
    4. What's Next?